Pressure regulating valve



March 4, 1947. M1.. osBoRN v 2,416,881

PRESSURE REQUITING AVALVE Filed July 17, i945 nun mul /f "f, 'ze 2,

3i 2z "2 f lL- 1) as 25 ,u 23

iNvENToR.

/6 f: 54 /3 MERLE L'. 05am/v.

Patent-ed Mar. 4,j 1947 STA Nir

' GFCIE -PaEssE andammo VALVE b Merle L. (isbom, Long Beach, Calif.Application `luly 17, 1945, Serial No. 665,534

Claims. (CL 133x-53) 2 i upper portion of the housing I0 and sealed to lthe Walls thereof by means of a suitable sealing Other objects andadvantages reside in the i detail construction of the invention, whichis designed for simplicity, economy',4 and eiliciency. These will becomemore apparent from the following description.

In the following detailed. description of the invention, reference ishad to the accompanying drawing which forms' apart hereof-.- Likenumerals refer to like parts in all views of the drawing and throughoutthe description.

In the drawing:

Fig. 1 is a, side elevation of the improved matic pressure,` regulatingvalve;

Fig. 2 is a similar view with the outer housing cut away to Aillustratethe internal mechanism; Fig. 3 isa Avertical cross-section through theimproved valve; and Fig. 4 is a cross-section, taken on the line 4--4Fig. 3.

auto- The improved pressure regulating valve is enclosed in a tubularhousing I0, the upper and lower extremities ofwhich are closed by meansof top and bottom' `end caps I I. and I2, respectively, secured theretoby' means of suitable attachrnent screws I3. The side of the housing isprovided with a supply inlet I4 and a return port I5. The end cap I2 isprovided with a controlled pressure outlet I6. Suitable nipples II, I8and I9 are threaded into the inlet I4, port I5 and outlet I6,respectively, for the attachment of any desired hydraulic tubing orpiping. The pressure inlet I4 is connected with any suitable source oflhydraulic iiuid under pressure and the opening I6 is connected with t/hedevice or devices usin the hydraulic duid-pressure. The invention isdesigned to maintain a preset uniform pressure at the outlet I6regardless of variations in pressure at the inlet I4 and demands of thedevice or devices connected thereto. This is accomplished by slidablymounting a valve cage within the housing II'I. .The cage is sealedadjacent its top and bottom to the internal wall of the housing I0 bymeans ofy neoprene sealing rings .23 'or by any 'other suitable sealingmeans and is'con'stantly urged downwardly in the housing I0 by means ofa compression spring 24. The spring 24 acts against a piston member 25slidably mounted in the ring 26. l

The cage contains an upper chamber 2i and a lower chamber 22. Fluid fromthe supply inlet i4 ows through ports 21 in the cage to theupper chamber2 I. This fluid is prevented from iiowlng into the upper portion of thehousingv I0 by means of .'a ball check valve 28 acting against a valveseat 29. VThe lball valve 28 is constantly urged toward its seat 29 bymeans of a valve spring 30.

vThe fluid can flow, however, to the -lower chamber 22 by forcing asecond ball A'check valve. 3l from its seat 32 in the cage 20. 'Thesecond ball check valve is constantly urged against the seat 32 by meansof a second valve spring 33 which prevents-return 'of iiuid to theupperi chamber 2|. The fluid escapes from the lower vchamber 22 throughan'escape port 34 into the lower portion of the housing to supply theoutlet I6. y

A portion of the fluid from the'lower portion of the housing I8 flowsthrough 'a'longitudinal' channel 35v in -the wall of the housing III vtoa pressure chamber vabove thefpiston'f' member 25.y

As the pressure builds up at"l the outlet I6; the

cage 20 and the-piston 25 lare forced toward each other compressing thespring 24; Eventually al point will be reached where avalve stem 43carried vby the vpiston 25 will contact the ball 28 and force it fromits seat A29. This allows .the excess num te nowinto thel interior ofther housing I8 andthrough the return vport I5 back to the reservoir orpressure pump supplying the original fiuid.-

The stem 43 is threaded through the piston.

25 and is sealedithereinbymeans of a suitable stem sealing gasket 36 andvvasherv 42. The

pressure at which the stem 43 will. force the ball 28 from its seat canbe preset by threading theV stem further into or out of the piston 25 soas to decrease orv increase its effective length. This presetting canbeaccomplished from the exterior of the housing through the medium of arotatable adjusting stud 31 extending, through the top cap II andprovided with a suitable jam nut38 forY setting `it in any desiredposition. The inner latter.

exterrnity of. the stud terminates in a screwdriver like blade 39 whichenters a slot in the upper extremity of the stem 43 for rotating the Thestem may move longitudinally' of the blade 39.

A stop' sleeve 40 extends inwardly-from the top cap to limit theupward-movement of the piston 25. This sleeve is provided with suitableAopenings 4| to allow the duid pressure to equalize within and withoutthe sleeve.

The operation oi' `the device lis believed to be apparent from theabove. The adjusting stud 31 is set for any desired hydraulic pressure,say, 100 p. s. i. When the pressure at the outlet I6 reaches 100 p. s.i., the piston 25 and the cage 2B will have compressedthe spring 24 to apoint where the stem 43 will contact the ball 28. Any further increasein pressure at the outlet4 I Siwill cause the stem to force the ball 28from its seat to allow the excess uid pressure to discharge through thereturn port i5.

Should 'any ot the internal mechanism become damaged or clogged, theentire assembly may be quickly 'removed and replaced simply by removingthe screws I3 in the upper cap. The improved pressure regulating valveis more particularlyy designed for use on aircraft hydraulic systems.The pressure regulating valves on these systems have been a source oftrouble and danger for should they fail the entire hydraulic controlsystem of the aircraft fails. This improved valve is very rarelysubjected to failure but should such failure occurdue to a chip of metalor other foreignv material, lodging under the ball valves,

` it is possible to remove the entire internal assembly and replace itwith a spare assembly while the aircraft is in iiight. The time requiredshould not exceed iive minutes and the only tool necessary is a screwdriver.

turn oi' fluid from said pressure outlet to saidk l pressure inlet.

While a specic form of the improvement has ,r

been describedand illustrated herein, it is desired to be understoodthat the same may be varied, within the scope of the appended claims,without departing from the spirit of the inven tion.

Having thus described the invention, what is l. A pressure regulatingvalve'comprisingz a housing having a cylindrical bore; a valve cage;

`a piston, said piston and cage being longitudinally movable in saidbore; a compression spring urging said cage and said piston away fromeach mally preventing fluid from owing into said bore toward saidpiston; a stem projecting from said piston toward said latter valve andpositioned to force thelatter from its seat when said spring has beencompressed a predetermined distance; a pressure outlet from said housingbelow said cage; a channel connecting said pressure outlet with saidbore above said piston ltc apply pressure to the latter; and a returnport in said housing intermediate said piston and said cage.

2. A pressure regulating valve comprising: a housing having acylindrical bore; a valve cage; a piston, said piston and cage beinglongitudinally movable in said bore; a compression spring urging saidcage-and said piston away from each other; a pressure inlet positionedin said housing opposite said cage; a valve in said cage normallypreventing `iluid from flowing into said bore toward said piston; a stemprojecting from said piston toward said latter valve and positioned toforce the latter from its seat when saidl spring has been compressed apredetermined distance; a pressure outlet from said housing below saidcage; a channel connecting said pressure outlet with said bore abovesaid piston to apply pressureto the latter; a return port in saidhousing intermediate saidlpistonand said cage; and a claimed and desiredsecured by Letters Patent is:

3. A pressure regulating valve comprising: a housing having acylindrical bore; a valve cage: a piston, said piston and cage beinglongitudinally movable in said bore; a compression spring urging saidcage and said piston ,away from each other; a pressure inlet positionedin said Ihousing opposite said cage; a valve in said cage normallypreventinguid from iiowing into said bore toward said piston; a stemprojecting from l said piston toward said latter valve and positioned toforce the latter from its seat when said spring has been compressed apredetermined distance; a pressure outlet from said housing below saidcage; a channel connecting said pressure outlet with said bore abovesaid piston to apply pressure to the latter; a return port in saidhousing intermediate said piston and said cage; and means on theexterior of vsaid housing for regulating the extension of said stem.

4. A pressure regulating valvev comprising: a housing having acylindrical bore; a valve cage; a piston, said piston and cage beinglongitudinally movable in said bore; a compression spring urging saidcage and said piston away from each other; a pressure inlet positionedin said housing opposite said cage; a valve in said cage normallypreventing uid from iiowing into said bore toward said piston; a stemprojecting from said piston toward said latter valve .and positioned toforce the latter from its seat when said spring has been compressed apredetermined distance; a pressure outlet from said housing below saidcage; a channel cpnnecting said pressure outlet with said bore aboves^aid piston to apply pressure to the latter; and a return port in s aidhousing intermediate said piston and said cage, said stem being threadedthrough said piston; and a member rotatable from the exterior of saidhousurging said cage and said piston away from each other; a pressureinlet positioned in said housing opposite said cage; a valve in saidcage normally preventing uid from owing into said bore toward saidpiston; a stem projecting from said piston toward said latter valve andpositioned to force the latter from its seat when said spring has beencompressed a predetermined distance; a pressure outlet from said housingbelow said cage; a channel connecting said pressure outlet with saidbore above said piston to apply pressure to the latter; a return port insaid housing intermediate said piston and said cage; and av cap closingsaid bore, all of the elements in said bore being removableby removal ofsaid cap. l. MERLE L. OSBORN.

REFERENCES CITED The following references are of record in the le of.this patent:

'UNITED STATES rATENTs

